Jasper Allen, two, spent five days in hospital after his severe chickenpox sores, which covered every inch of his body, became severely infected. Yet only 48 hours before he was rushed to hospital, his mum, Sarah Allen, claims he was refused a doctors appointment because a receptionist didn’t think his condition was severe enough.

It was so bad his mother Sarah, 36, said doctors considered contacting medical journals as they had never seen such an extreme case. He was put on an IV drip and given antiviral medication, antibiotics and morphine to help his ravaged body fight the virus.

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Mrs Allen claims two days before he required emergency treatment, she was refused an appointment at her local GP surgery because a receptionist did not think the condition was severe enough to warrant a visit. Now she is calling on the Government to make a vaccination against the disease - currently only available to certain children on medical grounds - free for all on the NHS.

“Everyone's reactions in the hospital were just complete shock over how severe it was - the doctors all wanted to come and see this worst ever case of chickenpox.

"There was even talk about using the pictures for a medical journal. One of the paediatric nurses with 40 years' experience said she had never seen anything like it. We couldn’t hold him for three days because he screamed every time we touched him.” Said Mrs Allen, who works as nursery manager at St Neots, Cambridegshire.